2 cubic feet too much for a pair of 8's?

Not sure how accurate this is but the pair of 8's on 800 watts is showing the same SPL as my RD 15 did on 500 watts when i designed the box for it using winisd..
can't always trust winisd though. after all it's only a program //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

 
here is what its showing

DDriver : xd8

Project by : STANKY1219

Project for : you

--

Number of drivers : 2

Box type : Vented

Box size : 1.600 ft^3

Tuning frequency : 33.00 Hz

Vent : 1 vent(s)

31.27 in length for each

2.00 x 12.00 in rectangle

Freq SPL

[Hz] [dB]

30.00 114.46

31.00 115.21

32.00 115.70

33.00 115.99

34.00 116.15

35.00 116.22

36.00 116.24

37.00 116.23

38.00 116.22

39.00 116.20

40.00 116.18

41.00 116.17

42.00 116.17

43.00 116.17

44.00 116.17

45.00 116.18

46.00 116.19

47.00 116.20

48.00 116.21

49.00 116.22

50.00 116.24

51.00 116.25

52.00 116.26

53.00 116.27

54.00 116.28

55.00 116.29

56.00 116.30

57.00 116.31

58.00 116.31

59.00 116.31

60.00 116.32

61.00 116.32

62.00 116.32

63.00 116.32

64.00 116.31

65.00 116.31

66.00 116.31

67.00 116.30

68.00 116.30

69.00 116.29

70.00 116.28

71.00 116.28

72.00 116.27

73.00 116.26

74.00 116.25

75.00 116.24

76.00 116.23

77.00 116.22

78.00 116.21

79.00 116.20

80.00 116.19

81.00 116.18

82.00 116.17

83.00 116.15

84.00 116.14

85.00 116.13

86.00 116.12

87.00 116.11

88.00 116.10

89.00 116.09

90.00 116.08

91.00 116.07

92.00 116.05

93.00 116.04

94.00 116.03

95.00 116.02

96.00 116.01

97.00 116.00

98.00 115.99

99.00 115.98

100.00 115.97

 
can't always trust winisd though. after all it's only a program //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif
I don't trust it , just use it as a basis for the first box , then if i'm not satisfied i start a build in the direction of the sound/performance i'm looking to achieve.

 
here is what its showing

Driver : xd8

Project by : STANKY1219

Project for : you

--

Number of drivers : 2

Box type : Vented

Box size : 1.600 ft^3

Tuning frequency : 33.00 Hz

Vent : 1 vent(s)

31.27 in length for each

2.00 x 12.00 in rectangle

Relative

Freq Gain SPL

[Hz] [dB] [dB]

30.00 -0.78 114.46

31.00 -0.04 115.21

32.00 0.46 115.70

33.00 0.75 115.99

34.00 0.91 116.15

35.00 0.98 116.22

36.00 1.00 116.24

37.00 0.99 116.23

38.00 0.98 116.22

39.00 0.96 116.20

40.00 0.94 116.18

41.00 0.93 116.17

42.00 0.93 116.17

43.00 0.93 116.17

44.00 0.93 116.17

45.00 0.94 116.18

46.00 0.95 116.19

47.00 0.96 116.20

48.00 0.97 116.21

49.00 0.98 116.22

50.00 1.00 116.24

51.00 1.01 116.25

52.00 1.02 116.26

53.00 1.03 116.27

54.00 1.04 116.28

55.00 1.05 116.29

56.00 1.06 116.30

57.00 1.06 116.31

58.00 1.07 116.31

59.00 1.07 116.31

60.00 1.08 116.32

61.00 1.08 116.32

62.00 1.08 116.32

63.00 1.08 116.32

64.00 1.07 116.31

65.00 1.07 116.31

66.00 1.07 116.31

67.00 1.06 116.30

68.00 1.06 116.30

69.00 1.05 116.29

70.00 1.04 116.28

71.00 1.03 116.28

72.00 1.03 116.27

73.00 1.02 116.26

74.00 1.01 116.25

75.00 1.00 116.24

76.00 0.99 116.23

77.00 0.98 116.22

78.00 0.97 116.21

79.00 0.96 116.20

80.00 0.95 116.19

81.00 0.94 116.18

82.00 0.92 116.17

83.00 0.91 116.15

84.00 0.90 116.14

85.00 0.89 116.13

86.00 0.88 116.12

87.00 0.87 116.11

88.00 0.86 116.10

89.00 0.85 116.09

90.00 0.84 116.08

91.00 0.82 116.07

92.00 0.81 116.05

93.00 0.80 116.04

94.00 0.79 116.03

95.00 0.78 116.02

96.00 0.77 116.01

97.00 0.76 116.00

98.00 0.75 115.99

99.00 0.74 115.98

100.00 0.73 115.97
tl;dr

 
so i talked to a few people that run or have ran these subs. and the conclusion is 2 cubes at 34hz is perfect for these subs. i never even gave them my thoughts on size at all , just asked questions and the answers have been unanimous. 2 cubes @ 34 hz and about 1K of clean power will rock these babies. if not , i can always modify the box later. LOL.

 
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